Tianjin Brisk Metalwork Co., Ltd. is one of the leading manufacturers and suppliers of large diameter lsaw pipe in China. We have world-leading production equipment and strong manufacturing capabilities. Please feel free to buy bulk durable large diameter lsaw pipe from our factory.
PRODUCT
Tianjin Brisk Steel focus on produce and supply hollow section and steel pipe
Quick Reference
| Item | Our Supply Range | |
|---|---|---|
| Outside diameter | 406 - 1420 mm | |
| Wall thickness | 8 - 60 mm | |
| Single-piece length | 6 - 12 m | |
| Forming process | JCOE, followed by cold expansion | |
| Seam welding | Double-sided submerged arc welding (SAW) | |
| Typical standards | API 5L(line pipe), ASTM A252 and EN 10219 (structural), or the specification in your tender | |
| Testing | Seam NDT, hydrostatic test per pipe on pressure orders, mechanical tests per heat | |
| Ends | Plain, bevelled, or square cut |
How Is Large Diameter LSAW Pipe Made, and What Do You Get from Each Step?
| Production Step | What Happens | What It Gives You | |
|---|---|---|---|
| Plate inspection | Plate is checked for thickness, surface and chemistry before cutting | Heat traceability from plate to finished pipe | |
| Edge milling | Plate edges are milled to a set width and bevel | A consistent weld groove along the full length | |
| JCOE forming | The plate is pressed into a J, then a C, then an O shape | A true round section without a spiral seam | |
| Tack and SAW welding | Inside and outside seam welds are made in submerged arc mode | A deep, even seam with high deposition quality | |
| Cold expansion | The pipe is expanded to a controlled diameter | Tight OD, improved roundness and relieved forming stress | |
| Inspection and test | Seam NDT, dimensional checks and hydrotest where required | A record for each pipe, not only each batch |
What Do We Check on the Seam?
- Seam position is marked on each pipe, so seams can be oriented as the installation or fabrication drawing requires.
- Non-destructive testing of the seam covers ultrasonic and radiographic methods.
- Mechanical tests per lot, including tensile and impact tests at the temperature in your specification.
- Hydrostatic testing per pipe on pressure orders, with the test pressure and hold time you specify.
Why Do Buyers Pick LSAW Over Other Large Diameter Routes?
- Wall thickness where you need it. LSAW is rolled from plate, so thick walls up to 50 mm do not depend on a seamless mill's size limit.
- A straight seam, not a helical one. The weld runs parallel to the pipe axis, so the load path in a pile, leg or pressure pipe is simple to assess.
- Plate chosen to your duty. Strength, toughness and chemistry come from the plate you specify, so low-temperature or sour-service plates can be selected at enquiry.
- Roundness that survives handling. Expansion sets the final diameter, so ends align for girth welding on site.
Where Is Large Diameter LSAW Pipe Used?
- Oil and gas transmission lines: trunk lines and gathering systems
- Water transmission mains and penstocks: long-distance supply and hydropower
- Heavy steel structures: bridge piers, wharves, large foundation piles
- Offshore and port structures: jacket members, sleeves, jetty piles
- Industrial plants: process lines and large columns
Who Orders Large Diameter LSAW Pipe, and What Do They Ask For?
- EPC contractors ask for length options, marked pipes and one set of documents for the whole order.
- Pipeline owners ask for plate toughness, seam testing and per-pipe test records.
- Piling contractors ask for heavy walls, square-cut ends and bevels ready for field splicing.
- Steel fabricators ask for tight OD control, so cans and sleeves fit without rework.
Project Example: 4.2 km Water Main, 350 Pipes
A water authority's contractor ordered OD 1,220 mm x 14.3 mm pipe for a 4.2 km transmission main, which comes to 350 pipes of 12 m. Because a leaking joint is expensive to dig up once the line is buried, they asked for every pipe to be hydrotested and recorded, not sampled.
We tested all 350 at the works and held back pipes that did not meet the record, then shipped with the test report attached to each pipe number. On site the crew welded the girth joints from marked ends without having to re-round pipes. No pipe was returned from the line after installation.
FAQ
Q: What is the largest diameter you can supply?
A: We roll up to OD 1,420 mm. For larger diameters, send your drawing and we will review the options.
Q: Can you supply pipe to API 5L?
A: Tell us the grade and PSL level in your tender, and we will quote to it, including the test list your inspector expects.
Q: Do you test every pipe hydrostatically?
A: On pressure orders, yes. State the test pressure and hold time at enquiry.
Related：SWAL STEEL PIPE
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